With Generic Scan Tool
Intake Manifold Change-over Valve, Checking
Solenoid valve is closed when no voltage is present.
Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram
Test requirements
- The respective fuses of Intake Manifold Change-Over Valve -N156- must be OK:
- Ignition switched off.
Test sequence
Vehicles with engine code AFP
- Disconnect 2-pin connector from Intake Manifold Change-Over Valve -N156- (arrow).
Vehicles with engine code BDF
- Disconnect 2-pin connector from Intake Manifold Change-Over Valve -N156- (arrow).
Continuation for all vehicles
- Measure resistance between terminals of solenoid valve.
Specified value: 25.0...35.0 Ohm
If specified value is not obtained:
- Replace Intake Manifold Change-Over Valve -N156-:
- Vehicles with engine code AFP, item 40,
- Vehicles with engine code BDF, item 2.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code.
Monitors, Trips, Drive Cycles and Readiness Codes
If specified value is obtained:
- Connect test box to control module wiring harness, connect test box for wiring test.
Test Box, Connecting For Wiring Test
Vehicles with engine code AFP
- Check wire between test box socket 104+2-pin connector terminal 2 for open circuit according to wiring diagram.
Wire resistance: max: 1.5 Ohm
Vehicles with engine code BDF
- Check wire between test box socket 121 + 2-pin connector terminal 2 for open circuit according to wiring diagram.
Wire resistance: max: 1.5 Ohm
Continuation for all vehicles
- Also check the wire for short circuit to B+ and Ground (GND).
Specified value: infinite Ohm
- Check wire between 2-pin connector terminal 1 and the Fuel Pump (FP) Relay -J17- for open circuit according to wiring diagram.
Wire resistance: max: 1.5 Ohm
If no malfunctions are found in wires:
- Replace Motronic Engine Control Module (ECM) -J220-.